ferret vs vole

ferret

verb
  • To hunt game with ferrets. 

  • To uncover and bring to light by searching; usually to ferret out. 

noun
  • A diligent searcher. 

  • An often domesticated mammal (Mustela putorius furo) rather like a weasel, descended from the polecat and often trained to hunt burrowing animals. 

  • The black-footed ferret, Mustela nigripes. 

vole

verb
  • To win all the tricks by a vole. 

noun
  • A deal in a card game, écarté, that draws all the tricks. 

  • Any of a large number of species of small rodents of the subfamily Arvicolinae of the family Cricetidae which are not lemmings or muskrats. 

How often have the words ferret and vole occurred in a corpus of books? (source: Google Ngram Viewer )